PHP+H5微信小程序webview嵌套H5支付（公司项目笔记）

1.h5转后台

mui.openWindow({
                    url: "转向后台的网址/doMiniPay?payMoney=" + n + "&buyContent=" + buyContent + "&uid=" + uid,
                    waiting: {
                        autoShow: true, //自动显示等待框，默认为true
                        title: '正在加载支付页面......', //等待对话框上显示的提示内容
                    }

                })

url：转向后台的网址
payMoney：支付金额
buyContent：支付说明举例：XXX公司充值
uid：用户id 用于将下单写入数据库

2.跳转小程序获取code

// 小程序webview支付
    public function doMiniPay()
    {
//        $oid = I("oid");
        $oid = $this->getOrderId();
        $payjs = "
            <script type='text/javascript' src='https://res.wx.qq.com/open/js/jweixin-1.3.2.js'></script>
            <script type='text/javascript'>
            wx.miniProgram.getEnv(function(res) {
                if (res.miniprogram) {
                    // 走在小程序的逻辑
                    var params = '?oid=" . $oid . "';
                    var path = '/pages/wxPay/wxPay'+params;
                    //document.write(params);
                    wx.miniProgram.navigateTo({url: path});
                }
            });
            </script>
          ";
        echo $payjs;
    }

getOrderId方法为获取随机数方法

public function getOrderId($uid)
    {
        //日期:10位 timestamp
        $datetime = time();
        //随机数
        $newnum = $this->getNonceNums();
        return $datetime . $newnum;
    }

3.小程序端获取code 向后台请求获取openid

var app = getApp()
Page({

  onLoad: function (options) {
    var that = this
    wx.setStorageSync('oid', options.oid);
    wx.login({
      success: function (res) {
        // 成功的话会返回：
        // {errMsg: "login:ok", code: "获取用户OpenID的ticket"}
        that.getOpenId(res.code)
      }
    })
  },
  getOpenId: function (jsCode) {
    var that = this
    wx.request({
      url: '后台获取openid方法的网址login方法',
      data: {
        js_code: jsCode // wx.login()时得到的ticket
      },
      success: function (res) {
        that.getPrePayId(res.data.openid)
      }
    })
  },
})

4.后端获取openid方法

 //小程序支付后端
    public function login()
    {
        $params['appid'] = '';// 小程序的appID
        $params['secret'] = '';//小程序的appsecret
        $params['js_code'] = $_GET['js_code'];

//      测试用的将值写入文档  
// file_put_contents('./lilllsss.txt',$_GET['js_code'],FILE_APPEND);

        $params['grant_type'] = 'authorization_code';


        $urls = "https://api.weixin.qq.com/sns/jscode2session?appid=".$params['appid']."&secret=".$params['secret']."&grant_type=authorization_code&js_code=".$params['js_code']."";

        $ch = curl_init();
        curl_setopt($ch, CURLOPT_URL, $urls);
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
        curl_setopt($ch, CURLOPT_POST, 1);
        curl_setopt($ch, CURLOPT_POSTFIELDS, $params);
        $output = curl_exec($ch);


        if (false === $output) {
            echo 'CURL Error:' . curl_error($ch);
        }

        echo $output;

    }

5.小程序方法拿着openid请求prepayid并进行下单

 getPrePayId: function (openId) {
    var that = this
    wx.request({
      url: '后台wxpay方法获取prepayid',
      data: {
        openid: openId,
        oid: wx.getStorageSync('oid')
      },
      success: function (res) {
        that.pay(res.data);
      }
    })
  },
  pay: function (data) {
    var that = this
    data.success = function (res) {
      that.payOver()
    }
    data.fail = function (res) {
      that.payOver()
    }
    wx.requestPayment(data)
  },

  payOver: function () {
    wx.reLaunch({
      url: '/pages/index/index?oid=' + wx.getStorageSync('oid')
    })
  }

6.后台下单微信返回xml信息将xml信息解析取到prepayid 打包数据返回给小程序端

// 小程序支付后端
    public function wxpay(){
        $oid = I("oid");
        $dao = M();
//        $sql = "这里是去订单信息的sql";
//        $orderRs = $dao->query($sql);

        $weiXin = new Weixin();

        $param['appid']             = '小程序的appid';
        $param['mch_id']            = "商户号";
        $param['nonce_str']         = $weiXin->getNonceNum();// 随机字符串
        $param['body']              = "粮多多充值";
        $param['out_trade_no']      = $this->getOrderId();//随机数+时间生成订单号
        $param['total_fee']         = 1;//支付金额
        $param['spbill_create_ip']  = $_SERVER['REMOTE_ADDR'];
        $param['notify_url']        = 'https://luoluotech.com/lddServer/pay/PayNotify.php';
        $param['trade_type']        = "JSAPI"; //H5 支付类型
        $param['openid']        = $_GET['openid'];



        // 按照要求计算sign

//        file_put_contents('./ldsdasdqweqwd.txt',$sequence,FILE_APPEND);
        ksort($param);
        $sequence = '';
        foreach ($param as $key => $value) {
            $sequence .= "$key=$value&";
        }

//        file_put_contents('./ldsdhiudsadqweqweqwd.txt',$sequence,FILE_APPEND);

        $apikey = "key商户平台自己设置的";// 这个是手动设置的

        $sequence = $sequence ."key=$apikey";
//        file_put_contents('./ldsddasdqwessfd.txt',$sequence,FILE_APPEND);
        $param['sign'] = strtoupper(md5($sequence));
//        file_put_contents('./ldsdhirethbgfb.txt',$param['sign'],FILE_APPEND);
        // 给微信发出的请求，整个参数是个XML

        $xml = '<xml>' . PHP_EOL;
        foreach ($param as $key => $value) {
            $xml .= "<$key>$value</$key>" . PHP_EOL;
        }
        $xml .= '</xml>';


        $ch = curl_init();
        curl_setopt($ch, CURLOPT_URL, 'https://api.mch.weixin.qq.com/pay/unifiedorder');
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
        curl_setopt($ch, CURLOPT_POST, 1);
        curl_setopt($ch, CURLOPT_POSTFIELDS, $xml);
        $output = curl_exec($ch);



        if (false === $output) {
            echo 'CURL Error:' . curl_error($ch);
        }

        // 下单成功的话，微信返回个XML，里面包含prepayID，提取出来 <prepay_id><![CDATA[这个就是我们要的值]]></prepay_id>

        if (0 === preg_match('/<prepay_id><\!\[CDATA\[(\w+)\]\]><\/prepay_id>/', $output, $match)) {
            echo $output;
            exit(0);
        }
        file_put_contents('./ldadsadqweqewdsdggdfggfb.txt',$output,FILE_APPEND);

        $weiXin = new Weixin();
        $prepayId = $match[1];
        $response['appId'] = '小程序appid';
        $response['nonceStr'] = $weiXin->getNonceNum();
        $response['package'] = 'prepay_id=' . $prepayId;
        $response['signType'] = 'MD5';
        $response['timeStamp'] =  (string) time();
        $sequence = '';
        foreach ($response as $key => $value) {
            $sequence .= "$key=$value&";
        }
        $response['paySign'] = strtoupper(md5("{$sequence}key=手动设置的商户key"));

        echo json_encode($response);
    }

7.小程序调起微信支付

pay: function (data) {
    var that = this
    data.success = function (res) {
      that.payOver()
    }
    data.fail = function (res) {
      that.payOver()
    }
    wx.requestPayment(data)
  },

  payOver: function () {
    wx.reLaunch({
      url: '/pages/index/index?oid=' + wx.getStorageSync('oid')
    })
  }

PHP+H5微信小程序webview嵌套H5支付（公司项目笔记）

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